HxD - HxD is a carefully designed and fast hex editor which, additionally to raw disk editing and...
IDA - The best-of-breed binary code analysis tool, an indispensable item in the toolbox of world-class software analysts, reverse engineers, malware analyst and cybersecurity professionals.
WinHex - WinHex hex editor, disk editor, RAM editor. Binary editor for files, disks, and RAM. Download HEX EDITOR. Sector editor. Drive editor.
Ghidra - Software Reverse Engineering (SRE) Framework
Hex Fiend - A fast and clever open source HEX editor for Mac OS X.
X64dbg - X64dbg is a debugging software that can debug x64 and x32 applications.